The [WebSockets spec](https://www.rfc-editor.org/rfc/rfc6455) states
that text messages must be valid UTF-8 encoded strings, which protobuf
messages virtually never are. This now correctly sends the protobuf events
as binary messages.
We change the format to correspond to CloudEvents, as originally intended,
and remove a redundant timestamp and newline.
We also bump the eventlogger to fix a race condition that this code triggers.
When subscriptions are too slow to accept messages on their channels,
then we should remove them from the fanout so that we don't have
dead subscriptions using up resources.
In addition, when a subscription is explicitly canceled, we should
also clean up after it remove the corresponding pipeline.
We also add a new metrics, `events.subscriptions`, to keep track
of the number of active subscriptions. This also helps us test.
Co-authored-by: Tom Proctor <tomhjp@users.noreply.github.com>
Also updates the event receieved to include a timestamp.
Websockets support both JSON and protobuf binary formats.
This can be used by either `wscat` or the new
`vault events subscribe`:
e.g.,
```sh
$ wscat -H "X-Vault-Token: $(vault print token)" --connect ws://127.0.0.1:8200/v1/sys/events/subscribe/abc?json=true
{"event":{"id":"5c5c8c83-bf43-7da5-fe88-fc3cac814b2e", "note":"testing"}, "eventType":"abc", "timestamp":"2023-02-07T18:40:50.598408Z"}
...
```
and
```sh
$ vault events subscribe abc
{"event":{"id":"5c5c8c83-bf43-7da5-fe88-fc3cac814b2e", "note":"testing"}, "eventType":"abc", "timestamp":"2023-02-07T18:40:50.598408Z"}
...
```
Co-authored-by: Tom Proctor <tomhjp@users.noreply.github.com>
This isn't perfect for sure, but it's solidifying and becoming a useful
base to work off.
This routes events sent from auth and secrets plugins to the main
`EventBus` in the Vault Core. Events sent from plugins are automatically
tagged with the namespace and plugin information associated with them.
For example, using:
```sh
vault server -dev -experiment events.beta1
```
Tested by checking that the events were enabled and disabled
when the `-experiment events.beta1` flag was present and absent.
Also added a small fix to pass the `hclog.Logger` in now so that
the logging hierarchy and levels are respected.
Creates a new `eventbus` package under `vault` with
an implementation of the `go-eventlogger` broker.
Also creates a stub of a common broker that will be accessible
in the core, and creates a simple event sending interface.
